I have never read any Calvinist theology or teacher or pastor that states that God is subordinate to our will and timing, but have seen that stated many ways in Non Cal circlesUltimately Calvinism minimizes God and elevates man.
In the Bible when God acts this is based on His own nature which is proclaimed. Sometimes God acts for a specific purpose and so that all do not respond He hardens their hearts (like with Pharoah - God's actions are no so benign that they do not draw men, so God hardened Pharoah's heart to accomplish His plan).
Real Calvinists would NEVER exalt the will of man and how "good" we still are to get the reason why and how God can now save us